From: Gerrit Renker Date: Mon, 1 Feb 2010 02:12:19 +0000 (+0000) Subject: dccp: fix bug in cache allocation X-Git-Tag: upstream/snapshot3+hdmi~15639^2~34 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8ed030dd0aa400d18c63861c2c6deb7c38f4edde;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git dccp: fix bug in cache allocation This fixes a bug introduced in commit de4ef86cfce60d2250111f34f8a084e769f23b16 ("dccp: fix dccp rmmod when kernel configured to use slub", 17 Jan): the vsnprintf used sizeof(slab_name_fmt), which became truncated to 4 bytes, since slab_name_fmt is now a 4-byte pointer and no longer a 32-character array. This lead to error messages such as FATAL: Error inserting dccp: No buffer space available >> kernel: [ 1456.341501] kmem_cache_create: duplicate cache cci generated due to the truncation after the 3rd character. Fixed for the moment by introducing a symbolic constant. Tested to fix the bug. Signed-off-by: Gerrit Renker Acked-by: Neil Horman Signed-off-by: David S. Miller --- diff --git a/net/dccp/ccid.c b/net/dccp/ccid.c index 57dfb9c..ff16e9d 100644 --- a/net/dccp/ccid.c +++ b/net/dccp/ccid.c @@ -83,7 +83,7 @@ static struct kmem_cache *ccid_kmem_cache_create(int obj_size, char *slab_name_f va_list args; va_start(args, fmt); - vsnprintf(slab_name_fmt, sizeof(slab_name_fmt), fmt, args); + vsnprintf(slab_name_fmt, CCID_SLAB_NAME_LENGTH, fmt, args); va_end(args); slab = kmem_cache_create(slab_name_fmt, sizeof(struct ccid) + obj_size, 0, diff --git a/net/dccp/ccid.h b/net/dccp/ccid.h index 269958b..6df6f8a 100644 --- a/net/dccp/ccid.h +++ b/net/dccp/ccid.h @@ -19,7 +19,9 @@ #include #include -#define CCID_MAX 255 +/* maximum value for a CCID (RFC 4340, 19.5) */ +#define CCID_MAX 255 +#define CCID_SLAB_NAME_LENGTH 32 struct tcp_info; @@ -49,8 +51,8 @@ struct ccid_operations { const char *ccid_name; struct kmem_cache *ccid_hc_rx_slab, *ccid_hc_tx_slab; - char ccid_hc_rx_slab_name[32]; - char ccid_hc_tx_slab_name[32]; + char ccid_hc_rx_slab_name[CCID_SLAB_NAME_LENGTH]; + char ccid_hc_tx_slab_name[CCID_SLAB_NAME_LENGTH]; __u32 ccid_hc_rx_obj_size, ccid_hc_tx_obj_size; /* Interface Routines */