Commit c9b47e6b2311 for kernel

commit c9b47e6b23114e939b17f818471c7a46e59006e7
Author: Michael Bommarito <michael.bommarito@gmail.com>
Date:   Tue Jul 14 07:47:29 2026 -0400

    erofs: cap LZMA stream pool size

    fs/erofs/decompressor_lzma.c sizes the module-global MicroLZMA stream
    pool from num_possible_cpus() when the lzma_streams module parameter is
    unset, then z_erofs_load_lzma_config() preallocates one image-supplied
    dictionary per stream, accepting dictionaries up to 8 MiB.  On high-CPU
    systems, a small EROFS image can pin hundreds of MiB of vmalloc-backed
    decoder state until the erofs module is unloaded.

    Impact: An EROFS image mounted by the system can pin up to 8 MiB of
    vmalloc memory per LZMA stream, either as intended or unexpectedly.

    Bound the default stream count by a new
    CONFIG_EROFS_FS_ZIP_LZMA_DEFAULT_MAX_STREAMS option, default 16, so the
    worst-case default preallocation is 128 MiB if the number of CPUs is no
    less than 16 while preserving the existing per-image dictionary limit.
    An explicit lzma_streams module parameter is still honoured as-is, so
    administrators who deliberately size the pool are not affected.

    Fixes: 622ceaddb764 ("erofs: lzma compression support")
    Cc: stable@vger.kernel.org
    Assisted-by: Claude:claude-opus-4-8
    Signed-off-by: Michael Bommarito <michael.bommarito@gmail.com>
    Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
    Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

diff --git a/fs/erofs/Kconfig b/fs/erofs/Kconfig
index 1feb28cfe557..8ca1767dafb6 100644
--- a/fs/erofs/Kconfig
+++ b/fs/erofs/Kconfig
@@ -131,6 +131,20 @@ config EROFS_FS_ZIP_LZMA

 	  Say N if you want to disable LZMA compression support.

+config EROFS_FS_ZIP_LZMA_DEFAULT_MAX_STREAMS
+	int "EROFS LZMA default maximum decompression streams"
+	depends on EROFS_FS_ZIP_LZMA
+	range 1 NR_CPUS
+	default 16
+	help
+	  By default EROFS allocates one LZMA decompression stream per CPU.
+	  Each stream can hold a dictionary of up to 8 MiB taken from the
+	  mounted image, so on systems with many CPUs this can reserve a lot
+	  of memory.  This caps the default; the lzma_streams module parameter
+	  still overrides it.
+
+	  If unsure, keep the default of 16.
+
 config EROFS_FS_ZIP_DEFLATE
 	bool "EROFS DEFLATE compressed data support"
 	depends on EROFS_FS_ZIP
diff --git a/fs/erofs/decompressor_lzma.c b/fs/erofs/decompressor_lzma.c
index f6692d0f2f04..6b0cdb446c6a 100644
--- a/fs/erofs/decompressor_lzma.c
+++ b/fs/erofs/decompressor_lzma.c
@@ -51,7 +51,8 @@ static int __init z_erofs_lzma_init(void)

 	/* by default, use # of possible CPUs instead */
 	if (!z_erofs_lzma_nstrms)
-		z_erofs_lzma_nstrms = num_possible_cpus();
+		z_erofs_lzma_nstrms = min_t(unsigned int, num_possible_cpus(),
+				CONFIG_EROFS_FS_ZIP_LZMA_DEFAULT_MAX_STREAMS);

 	for (i = 0; i < z_erofs_lzma_nstrms; ++i) {
 		struct z_erofs_lzma *strm = kzalloc_obj(*strm);